mdss: mdp3: verify return value from iommu and bw calls
mdss: mdp3: verify return value from iommu and bw calls

When driver was enabling/disabling iommu it was not verifying
return values of the call. Same with bw set quota call.

Change-Id: I8755335bffd5d52720f8a5d735427b5306eab512
Signed-off-by: Terence Hampson <510e4a431f3db308834233abb54664dadf1d9d42@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas