Revert "gic: add functions to check for and clear specific pending interrupt"

This reverts commit 493bd064 and
the subsequent patch that renamed the functions
84dd82a8. This functionality is
no longer used because the RPM driver doesn't support being
called in atomic context.

Change-Id: I4a46de2c0721f50fbc2b36f26cfa1fa27d30481f
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>