XDMA: reg_rw fix and MM aperture update

Updated the Support Link

Added support for MM channel configuration, Keyhole feature support  and addressed customer issues

MM Channel configuration
Keyhole feature support
resolve the page allocation issues

QDMA DPDK 2020.2.1 Driver Release to support DPDK v20.11 Framework Changes

2020.2 QDMA Linux Driver README File updated with proper simlink

2020.2 QDMA Linux Driver Release

2020.2 QDMA DPDK Driver Release

2020.2 QDMA Windows Driver Release

XDMA: dma_from/to_device: do NOT mark partial completion as failure. the bw is not calculated in the case of underflow (partial completion).

XDMA: 1. split module parameter sgdma_timeout to h2c_timeout & c2h_timeout. 2. value of 0 means no timeout (i.e., wait forever).

Fix warnings

2020.2 XVSEC Driver Release documentation updates pointing to https://xilinx.github.io/dma_ip_drivers/

2020.2 XVSEC Driver Release - Supports the MCAP functionality for US/US+ and Versal Devices

no need to use __init and __exit. Attributes are set by the the
module_init/module_exit macros

set name length to 16 and use snprintf

XDMA: fix build for Centos and RHEL

libxdma: fix next adjacent descriptors

Various fixes

XDMA: Mark engine as not running when stopping after timeouts

Change the checks for kernel versions to include checks for RHEL
versions in case they are present.
Add HAS_MMIOWB, ACCESS_OK_2_ARGS, HAS_WAKE_UP, and HAS_WAKE_UP_ONE
and use them

Updated the apps/include/qdma_nl.h

Updated the qdma_nl.h

Updated the license header for QDMA Linux Driver application include files

Fix the setting of the next adjacent fields in descriptors.

Following commit 5faf23ec the next_adj field of all descriptors is set
according to the index of the descriptor rather than its address which
causes issues when dma_alloc_coherent doesn't return an address which is
page aligned (which happens).
Moreover, in the case of a transfer which number of descriptors is
bigger than a full page, the next_adj field is set to the maximum (63)
for all descriptors untill the last page of descriptors where it starts
decreasing.
Last, even before this commit, the next_adj field inside a block of
adjacent descriptors is not decreasing untill coming near page end,
which is not compliant with what the documentation says :

"Every descriptor in the descriptor list must accurately describe the descriptor
or block ofdescriptors that follows. In a block of adjacent descriptors, the
Nxt_adj value decrements from the first descriptor to the second to last
descriptor which has a value of zero. Likewise, eachdescriptor in the block
points to the next descriptor in the block, except for the last descriptor
which might point to a new block or might terminate the list."

This commit aligns the blocks of adjacent descriptors to
XDMA_MAX_ADJ_BLOCK_SIZE and makes the next_adj field decrease inside
each block untill the second to last descriptor in the block or in the
full transfer. The size of the page being a multiple of the size of the
block (4096 = sizeof(xdma_desc) * 128 =
sizeof(xdma_desc) * 2 * XDMA_MAX_ADJ_BLOCK_SIZE

Resolved HW errors observed with QDMA4.0 MM only design