Fix IPATH not pushing to PeriphDriver sub-makes

Author: Jake-Carter

Libraries/PeriphDrivers/periphdriver.mk

@@ -99,7 +99,7 @@ export PERIPH_DRIVER_BUILD_DIR
 LIBS += ${PERIPH_DRIVER_BUILD_DIR}/${PERIPH_DRIVER_LIB}
 # Add rule to build the Driver Library
 ${PERIPH_DRIVER_BUILD_DIR}/${PERIPH_DRIVER_LIB}: ${PERIPH_DRIVER_C_FILES} ${PERIPH_DRIVER_A_FILES} ${PROJECTMK}
-	@$(MAKE) -f ${PERIPH_DRIVER_DIR}/libPeriphDriver.mk  lib BUILD_DIR=${PERIPH_DRIVER_BUILD_DIR} PROJ_CFLAGS="$(PROJ_CFLAGS)" PROJ_LDFLAGS="$(PROJ_LDFLAGS)" MXC_OPTIMIZE_CFLAGS=$(MXC_OPTIMIZE_CFLAGS) MFLOAT_ABI=$(MFLOAT_ABI) DUAL_CORE=$(DUAL_CORE) RISCV_CORE=$(RISCV_CORE) PROJECTMK=$(PROJECTMK) PERIPH_DRIVER_LIB_FILENAME=$(PERIPH_DRIVER_LIB_FILENAME)
+	@$(MAKE) -f ${PERIPH_DRIVER_DIR}/libPeriphDriver.mk  lib BUILD_DIR=${PERIPH_DRIVER_BUILD_DIR} PROJ_CFLAGS="$(PROJ_CFLAGS)" PROJ_LDFLAGS="$(PROJ_LDFLAGS)" MXC_OPTIMIZE_CFLAGS=$(MXC_OPTIMIZE_CFLAGS) IPATH="$(IPATH)" MFLOAT_ABI=$(MFLOAT_ABI) DUAL_CORE=$(DUAL_CORE) RISCV_CORE=$(RISCV_CORE) PROJECTMK=$(PROJECTMK) PERIPH_DRIVER_LIB_FILENAME=$(PERIPH_DRIVER_LIB_FILENAME)
 
 clean.periph:
 	@$(MAKE) -f ${PERIPH_DRIVER_DIR}/libPeriphDriver.mk BUILD_DIR=${PERIPH_DRIVER_BUILD_DIR} PERIPH_DRIVER_LIB_FILENAME=$(PERIPH_DRIVER_LIB_FILENAME) clean