Drivers that use the SSB sprom functionality typically 'select SSB_SPROM'
from Kconfig, but CONFIG_SSB_HOST_SOC misses this, which results in
a build failure unless at least one of the other drivers that selects
it is enabled:

drivers/built-in.o: In function `ssb_host_soc_get_invariants':
(.text+0x459494): undefined reference to `ssb_fill_sprom_with_fallback'

This adds the same select statement that is used elsewhere.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 541c9a84cd85 ("ssb: pick SoC invariants code from MIPS BCM47xx arch")
---
I'm not sure who the right person is to pick up the fix. The patch that
introduced the problem was merged by Kalle through the iwlwifi tree.

diff --git a/drivers/ssb/Kconfig b/drivers/ssb/Kconfig
index 0c675861623f..d8e4219c2324 100644
--- a/drivers/ssb/Kconfig
+++ b/drivers/ssb/Kconfig

@@ -83,6 +83,7 @@ config SSB_SDIOHOST
 config SSB_HOST_SOC
 	bool "Support for SSB bus on SoC"
 	depends on SSB && BCM47XX_NVRAM
+	select SSB_SPROM
 	help
 	  Host interface for a SSB directly mapped into memory. This is
 	  for some Broadcom SoCs from the BCM47xx and BCM53xx lines.