ARM: OMAP2+: serial: Remove the un-used slave idle hooks
ARM: OMAP2+: serial: Remove the un-used slave idle hooks

UART IP idle handling now taken care by runtime pm backend(hwmod) indirectly
and OMAP serial driver is also cleaned up accordingly.

So remove the un-used slave idle platforms hooks now.

Tested-by: Vaibhav Bedia <a79877833f22db6ca05085a1f0a969ecc145a84f@ti.com>
Tested-by: Sourav Poddar <622174b0059324e3873cdaa4bff5b59554c7d88a@ti.com>
Signed-off-by: Rajendra nayak <4802c9324e296bd4f067f90ad87878b5665d33d2@ti.com>
Signed-off-by: Santosh Shilimkar <5b4d8dc9ea337fff5fd1729321eda9873ade0b09@ti.com>
Reviewed-by: Kevin Hilman <f9849b02abe18c1ece6bd40346458ed53f49d31b@linaro.org>
Tested-by: Kevin Hilman <f9849b02abe18c1ece6bd40346458ed53f49d31b@linaro.org>  # OMAP4/Panda
Signed-off-by: Paul Walmsley <a027184a55211cd23e3f3094f1fdc728df5e0500@pwsan.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs