msm7x27a: Fix acpuclock code for 7x27a.

In 7x27a, A11S_CLK_SEL register supports new settings. While
configuring AHB_CLK_DIV and CLK_SEL_SRC, other bits should remain
unaffected.

Change-Id: Ic258fe5f28302ff9b47db6515359dc2dafcfcec9
1 file changed