sm8450-common: Fix user builds

device/qcom/sepolicy_vndr only includes the files that define
vendor_sensors_debug_prop on eng and userdebug builds, so we have to
wrap access to it in a call to userdebug_or_eng.

Change-Id: I4e2662ec29e7ebb4ea1b8616d360307f92e89834
Signed-off-by: Jens Reidel <adrian@travitia.xyz>

sepolicy/vendor/hal_citsensorservice_xiaomi.te

@@ -47,4 +47,4 @@ allowxperm vendor_hal_citsensorservice_xiaomi_default self:socket ioctl { 0xc300
 allowxperm vendor_hal_citsensorservice_xiaomi_default self:qipcrtr_socket ioctl { 0xc300 0xc301 0xc302 0xc303 0xc304 0xc305 };
 
 get_prop(vendor_hal_citsensorservice_xiaomi_default, vendor_sensors_prop)
-get_prop(vendor_hal_citsensorservice_xiaomi_default, vendor_sensors_debug_prop)
+userdebug_or_eng(`get_prop(vendor_hal_citsensorservice_xiaomi_default, vendor_sensors_debug_prop)');