msm: kgsl: Fixup the RSCC register offsets

The RSCC registers were mapped at the wrong offset,
fix the offset for a6x.

Change-Id: I2f88f58520806bdf2b1c0440f1616744cfa77eea
Signed-off-by: Urvashi Agrawal <urvaagra@codeaurora.org>
Signed-off-by: Carter Cooper <ccooper@codeaurora.org>