firmware: tegra: Fix IVC dependency problems

The IVC code is library code that other drivers need to select if they
need that library. However, if the symbol is user-selectable this can
lead to conflicts.

Fix this by making the symbol only selectable for COMPILE_TEST and add
a select TEGRA_IVC to TEGRA_BPMP, which is currently the only user.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Thierry Reding <[email protected]>

drivers/firmware/tegra/Kconfig

@@ -2,7 +2,7 @@
 menu "Tegra firmware driver"
 
 config TEGRA_IVC
-	bool "Tegra IVC protocol"
+	bool "Tegra IVC protocol" if COMPILE_TEST
 	depends on ARCH_TEGRA
 	help
 	  IVC (Inter-VM Communication) protocol is part of the IPC
@@ -13,8 +13,9 @@ config TEGRA_IVC
 
 config TEGRA_BPMP
 	bool "Tegra BPMP driver"
-	depends on ARCH_TEGRA && TEGRA_HSP_MBOX && TEGRA_IVC
+	depends on ARCH_TEGRA && TEGRA_HSP_MBOX
 	depends on !CPU_BIG_ENDIAN
+	select TEGRA_IVC
 	help
 	  BPMP (Boot and Power Management Processor) is designed to off-loading
 	  the PM functions which include clock/DVFS/thermal/power from the CPU.