build: qcom_target: Define MSM_VIDC_TARGET_LIST

Currently, in the media HAL, we're replacing the usage
of this variable with a check for TARGET_BOARD_PLATFORM.

Instead of having to do that every time a new branch is made,
define the variable in qcom_target.

Change-Id: Idd85b6f0b167bbc64833eb03335abcaa7b9de4a9
diff --git a/build/core/qcom_target.mk b/build/core/qcom_target.mk
index 186f836..2d21a97 100644
--- a/build/core/qcom_target.mk
+++ b/build/core/qcom_target.mk
@@ -65,17 +65,22 @@
     2ND_CLANG_TARGET_GLOBAL_CPPFLAGS += $(qcom_flags)
 
     ifeq ($(call is-board-platform-in-list, $(B_FAMILY)),true)
+        MSM_VIDC_TARGET_LIST := $(B_FAMILY)
         QCOM_HARDWARE_VARIANT := msm8974
     else
     ifeq ($(call is-board-platform-in-list, $(B64_FAMILY)),true)
+        MSM_VIDC_TARGET_LIST := $(B64_FAMILY)
         QCOM_HARDWARE_VARIANT := msm8994
     else
     ifeq ($(call is-board-platform-in-list, $(BR_FAMILY)),true)
+        MSM_VIDC_TARGET_LIST := $(BR_FAMILY)
         QCOM_HARDWARE_VARIANT := msm8916
     else
     ifeq ($(call is-board-platform-in-list, $(UM_FAMILY)),true)
+        MSM_VIDC_TARGET_LIST := $(UM_FAMILY)
         QCOM_HARDWARE_VARIANT := msm8937
     else
+        MSM_VIDC_TARGET_LIST := $(TARGET_BOARD_PLATFORM)
         QCOM_HARDWARE_VARIANT := $(TARGET_BOARD_PLATFORM)
     endif
     endif