platform/x86: Allow for SMBIOS backend defaults

Avoid accidental configurations by setting default y for DELL_SMBIOS
backends. Avoid this impacting the default build size, by making them
dependent on DELL_SMBIOS, so they only appear when DELL_SMBIOS is
manually selected, or by DELL_LAPTOP or DELL_WMI.

While DELL_SMBIOS does have a prompt, it does not have any dependencies.
Keeping DELL_SMBIOS visible, despite being "select"ed by DELL_LAPTOP and
DELL_WMI, is a deliberate choice to provide context for the WMI and SMM
backends, which would otherwise appear to float without context within
the menu.
Signed-off-by: NDarren Hart (VMware) <dvhart@infradead.org>

drivers/platform/x86/Kconfig

@@ -115,9 +115,10 @@ config DELL_SMBIOS
 
 config DELL_SMBIOS_WMI
 	bool "Dell SMBIOS driver WMI backend"
+	default y
 	depends on ACPI_WMI
 	select DELL_WMI_DESCRIPTOR
-	select DELL_SMBIOS
+	depends on DELL_SMBIOS
 	---help---
 	This provides an implementation for the Dell SMBIOS calling interface
 	communicated over ACPI-WMI.
@@ -128,8 +129,9 @@ config DELL_SMBIOS_WMI
 
 config DELL_SMBIOS_SMM
 	bool "Dell SMBIOS driver SMM backend"
+	default y
 	depends on DCDBAS
-	select DELL_SMBIOS
+	depends on DELL_SMBIOS
 	---help---
 	This provides an implementation for the Dell SMBIOS calling interface
 	communicated over SMI/SMM.