For TX5 MUX registers, offset is not followed
in TXn order. Update driver to read/write correct
register offset when TX5 MUX registers access.
CRs-Fixed: 2218938
Change-Id: I8958b6cd1847967cbd37e7145c9f3909b0b8853b
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>