Tegra: remove "platform_get_core_pos" function

This patch removes the deprecated 'plat_core_pos_by_mpidr' function
from the Tegra platform port.

Change-Id: I32e06cb7269e4fbfaf9ad6c26d0722201f982f9e
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/aarch64/tegra_helpers.S

@@ -166,23 +166,6 @@ func plat_get_my_entrypoint
 	ret
 endfunc plat_get_my_entrypoint
 
-	/* -----------------------------------------------------
-	 * int platform_get_core_pos(int mpidr);
-	 *
-	 * result: CorePos = (ClusterId * cpus per cluster) +
-	 *                   CoreId
-	 * -----------------------------------------------------
-	 */
-func platform_get_core_pos
-	and	x1, x0, #MPIDR_CPU_MASK
-	and	x0, x0, #MPIDR_CLUSTER_MASK
-	lsr	x0, x0, #MPIDR_AFFINITY_BITS
-	mov	x2, #PLATFORM_MAX_CPUS_PER_CLUSTER
-	mul	x0, x0, x2
-	add	x0, x1, x0
-	ret
-endfunc platform_get_core_pos
-
 	/* -----------------------------------------------------
 	 * void plat_secondary_cold_boot_setup (void);
 	 *