msm: mdss: hdmi: fix return code when modifying hpd state
msm: mdss: hdmi: fix return code when modifying hpd state

HDMI Tx's hot-plug detect circuit is enabled and disabled through
sysfs. If the new value is same as the current one then return success
instead of returning an error.

Change-Id: Id3c75739d48290dedb9bbf5a39b81650eae03766
Signed-off-by: Ujwal Patel <168a6a722f36cbfb19d9b32bbc952ac3ffb3b983@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