soc: marvell: hw_access: renaming to hw access driver

commit a4ae1e4887b9ac3b4c2c2500939942ab32c806cd from
git@git.assembla.com:cavium/WindRiver.linux.git

Since the scope of this driver wont be limited to just CSR
access but much more than that.

Change-Id: I75fa7af74a28ce95a40ad68b0444721973cec4b2
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/55859
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Tested-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>