ARM: dts: msm: Use macro definitions for interrupts for regulators

There are some preprocessor macros that represent the supported values
for the `interrupts' property.  Currently we're just hard-coding the
numerical values, which is hard to understand.  Fix this by using the
macros.

Change-Id: I85d07249654e3742dd64103f8fc888aa5287fced
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>