ARM: Fix RTIC MPGen failure with clang compiler

Add flags for the compilation of RTIC MP. Additional
checks to ensure rtic mp failure does not cause
kernel compilation to fail.

Change-Id: I01c87f848c24b31092b8871f6188ace4a4803ec9
Signed-off-by: Preeti Nagar <pnagar@codeaurora.org>
1 file changed