Select HW_RANDOM_BCM63XX only in the SoCs that support it.

Only BCM6368, BCM6362 and BCM63268 have a hardware random numbers generator, so, if none of these are selected, don't compile a driver that has no effect.

Tested with BCM6358 and BCM6328 successfully.

Signed off by: José Vázquez Fernández <ppvazquez...@gmail.com>

diff -urN a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
--- a/drivers/char/hw_random/Kconfig	2014-06-06 12:21:38.677781666 +0200
+++ b/drivers/char/hw_random/Kconfig	2014-06-05 20:58:11.000000000 +0200
@@ -75,7 +75,7 @@
 
 config HW_RANDOM_BCM63XX
 	tristate "Broadcom BCM63xx Random Number Generator support"
-	depends on HW_RANDOM && BCM63XX
+	depends on HW_RANDOM && (BCM63XX_CPU_6362 || BCM63XX_CPU_6368 || BCM63XX_CPU_63268)
 	default HW_RANDOM
 	---help---
 	  This driver provides kernel-side support for the Random Number
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