Factor out the sdm845 device configuration

Moved files around in a new shared/ folder. Renamed relevant
files and updated relative path. No feature changes.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
[caleb: rebased on 734404a]
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/enchilada/BoardConfig.mk b/enchilada/BoardConfig.mk
index 536b0e4..ecb3676 100644
--- a/enchilada/BoardConfig.mk
+++ b/enchilada/BoardConfig.mk
@@ -1,4 +1,4 @@
-include device/generic/sdm845/BoardConfigCommon.mk
+include device/generic/sdm845/shared/BoardConfig.mk
 
 # Copied from https://github.com/LineageOS/android_device_oneplus_sdm845-common/blob/lineage-16.0/BoardConfigCommon.mk
 # Board Information