drivers: qcom: replace ARCH_QCOM with ARCH_MSM

In order to compile internal code sources rather than
their upstream counterparts replace ARCH_QCOM with ARCH_MSM
and point the to correct code source directories.

Drop mdss clocks from the drivers/clk/qcom/Makfile.

Signed-off-by: Abhimanyu Kapur <abhimany@codeaurora.org>