FP5: Don't set BOARD_API_LEVEL

build/make/core/board_config.mk:1001: error: BOARD_API_LEVEL must not
set manully. The build system automatically sets this value..

Change-Id: If59ae9dea6cb13701d7217a1c0a355d4e07113eb
diff --git a/device.mk b/device.mk
index c3640a7..a677d09 100644
--- a/device.mk
+++ b/device.mk
@@ -91,8 +91,7 @@
     frameworks/native/data/etc/android.hardware.bluetooth_le.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.hardware.bluetooth_le.xml
 
 # Board API level
-BOARD_API_LEVEL := 30
-BOARD_SHIPPING_API_LEVEL := $(BOARD_API_LEVEL)
+BOARD_SHIPPING_API_LEVEL := 30
 
 # Boot control
 PRODUCT_PACKAGES += \