soc: qcom: Select QMI Helper functions standalone

The QRTR sample may not always be enabled. Allow the QMI Helper
functions to be selected by adding a label and a dependency on QRTR.
Remove the selects statement in the samples Kconfig.

Change-Id: I4c77381bab32f4579ca9aaa05bd76ff569cb3817
Signed-off-by: Chris Lew <clew@codeaurora.org>

drivers/soc/qcom/Kconfig

@@ -68,7 +68,8 @@ config QCOM_PM
 	  low power modes.
 
 config QCOM_QMI_HELPERS
-	bool
+	bool "Qualcomm QMI Helpers"
+	depends on QRTR
 	help
 	  Helper library for handling QMI encoded messages.  QMI encoded
 	  messages are used in communication between the majority of QRTR

samples/Kconfig

@@ -64,8 +64,7 @@ config SAMPLE_KDB
 
 config SAMPLE_QRTR_CLIENT
 	tristate "Build qrtr client sample -- loadable modules only"
-	depends on m
-	select QCOM_QMI_HELPERS
+	depends on QCOM_QMI_HELPERS && m
 	help
 	  Build an qrtr client sample driver, which demonstrates how to
 	  communicate with a remote QRTR service, using QMI encoded messages.