arm: tegra: nvmap: Update nvmap_alloc api.

Update nvmap_alloc api to take heap_mask as arg.
This is to let clients specify the specific heap needed.

Change-Id: I9950b3e60e6dac0301b6dc66be3e9d0bab8e0fee
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/90471
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User

Conflicts:
	drivers/media/video/tegra/avp/avp.c
	drivers/media/video/tegra/nvavp/nvavp_dev.c
	drivers/video/tegra/host/gr3d/gr3d.c
	drivers/video/tegra/host/gr3d/gr3d_t20.c
	drivers/video/tegra/host/gr3d/gr3d_t30.c
	drivers/video/tegra/host/host1x/host1x_cdma.c
	drivers/video/tegra/host/mpe/mpe.c
	drivers/video/tegra/host/nvhost_job.c