target: msm8994: Move boot device detection to common code

Boot device detection is common to all upcoming targets. So we can make
the code common instead of having target specific changes.

CRs-Fixed: 612217
Change-Id: Ic4f57af4baa48700929554674ad8dadfc57c6b7d
diff --git a/project/msm8994.mk b/project/msm8994.mk
index dbb392b..a53944b 100644
--- a/project/msm8994.mk
+++ b/project/msm8994.mk
@@ -10,6 +10,7 @@
 EMMC_BOOT := 1
 ENABLE_SDHCI_SUPPORT := 1
 ENABLE_UFS_SUPPORT   := 1
+ENABLE_BOOT_CONFIG_SUPPORT := 1
 
 #DEFINES += WITH_DEBUG_DCC=1
 DEFINES += WITH_DEBUG_UART=1