msm: ipa: Fix compilation errors when DEBUG_FS is disabled

Fix compilation error when CONFIG_DEBUG_FS is disabled in
perf_defconfig.

Change-Id: Ic79f26ebb8fd985c3cdb70703680a522d015897d
Signed-off-by: Armaan Siddiqui <asiddiqu@codeaurora.org>
[rshaha@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Rahul Shahare <rshaha@codeaurora.org>