net: ipa: fix two symbol names

All field mask symbols are defined with a "_FMASK" suffix, but
EOT_COAL_GRANULARITY and DRBIP_ACL_ENABLE are defined without one.
Fix that.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>