QCLINUX: mem-dump: add memory dump device driver

Create memory dump device driver for matching the memory dump v2 driver
without DT configuration.

Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>

Author: jiegan0107

arch/arm64/configs/qcom_debug.config

@@ -1,3 +1,4 @@
 CONFIG_QCOM_DCC=m
 CONFIG_QCOM_DCC_DEV=m
 CONFIG_QCOM_MEMORY_DUMP_V2=m
+CONFIG_QCOM_MEMORY_DUMP_DEV=m

drivers/firmware/qcom/Kconfig

@@ -83,4 +83,10 @@ config QCOM_MEMORY_DUMP_V2
 	  of deadlocks or cpu hangs these dump regions are captured to
 	  give a snapshot of the system at the time of the crash.
 
+config QCOM_MEMORY_DUMP_DEV
+	tristate "QCOM Memory Dump V2 device stub"
+	depends on QCOM_MEMORY_DUMP_V2
+	help
+	  Device stub for memory dump V2 driver.
+
 endmenu

drivers/firmware/qcom/Makefile

@@ -9,3 +9,4 @@ obj-$(CONFIG_QCOM_TZMEM)	+= qcom_tzmem.o
 obj-$(CONFIG_QCOM_QSEECOM)	+= qcom_qseecom.o
 obj-$(CONFIG_QCOM_QSEECOM_UEFISECAPP) += qcom_qseecom_uefisecapp.o
 obj-$(CONFIG_QCOM_MEMORY_DUMP_V2) += memory_dump_v2.o
+obj-$(CONFIG_QCOM_MEMORY_DUMP_DEV) += memory_dump_dev.o