soc: qcom: Add memshare service

This QMI service provides memory region for remote processors (like
modem) on request. It is known to be used in GPS service in modem
firmware for some (most) of msm8916 devices.

This commit implements "guaranteed allocation" of memory using
reserved-memory regions because gps service crashes on some devices
unless specific address was provided.

Signed-off-by: Nikita Travkin <nikitos.tr@gmail.com>

drivers/soc/qcom/Kconfig

@@ -209,4 +209,14 @@ config QCOM_APR
 	  application processor and QDSP6. APR is
 	  used by audio driver to configure QDSP6
 	  ASM, ADM and AFE modules.
+
+config QCOM_MEMSHARE_QMI_SERVICE
+       select QCOM_QMI_HELPERS
+       tristate "Qualcomm shared Heap for external processors"
+       help
+	  Memory Share Kernel Qualcomm Messaging Interface Service
+	  receives requests from Modem Processor Sub System
+	  for heap alloc/free from Application Processor
+	  Sub System and send a response back to client with
+	  proper handle/address.
 endmenu

drivers/soc/qcom/Makefile

@@ -27,3 +27,5 @@ obj-$(CONFIG_QCOM_LLCC) += llcc-qcom.o
 obj-$(CONFIG_QCOM_RPMHPD) += rpmhpd.o
 obj-$(CONFIG_QCOM_RPMPD) += rpmpd.o
 obj-$(CONFIG_QCOM_KRYO_L2_ACCESSORS) +=	kryo-l2-accessors.o
+obj-$(CONFIG_QCOM_MEMSHARE_QMI_SERVICE) += qcom_memshare.o
+qcom_memshare-y := memshare.o memshare_qmi_msg.o