rtc: kconfig: fix RTC_INTF defaults connected to RTC_CLASS

Commit 6b8029f ("rtc: kconfig: remove unnecessary dependencies")
removed various 'depends on RTC_CLASS' dependencies but also removed a
few 'default RTC_CLASS' statements, which actually changed default
behavior.

This resulted in the various RTC interfaces (sysfs, proc, dev) all being
disabled by default, even when RTC_CLASS is enabled:

   # CONFIG_RTC_INTF_SYSFS is not set
   # CONFIG_RTC_INTF_PROC is not set
   # CONFIG_RTC_INTF_DEV is not set

which is different from previous behavior (all of these where enabled.)

To fix, add back the 'default RTC_CLASS' statments to each of the
RTC_INTF_* options.

I noticed this because some RTC tests started failing on my TI OMAP
platforms because /dev/rtc0 was not present anymore, even though the
driver was present and RTC_CLASS was enabled.

Signed-off-by: Kevin Hilman <khilman@ti.com>
Acked-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/rtc/Kconfig

@@ -59,6 +59,7 @@ comment "RTC interfaces"
 config RTC_INTF_SYSFS
 	boolean "/sys/class/rtc/rtcN (sysfs)"
 	depends on SYSFS
+	default RTC_CLASS
 	help
 	  Say yes here if you want to use your RTCs using sysfs interfaces,
 	  /sys/class/rtc/rtc0 through /sys/.../rtcN.
@@ -68,6 +69,7 @@ config RTC_INTF_SYSFS
 config RTC_INTF_PROC
 	boolean "/proc/driver/rtc (procfs for rtcN)"
 	depends on PROC_FS
+	default RTC_CLASS
 	help
 	  Say yes here if you want to use your system clock RTC through
 	  the proc interface, /proc/driver/rtc.
@@ -79,6 +81,7 @@ config RTC_INTF_PROC
 
 config RTC_INTF_DEV
 	boolean "/dev/rtcN (character devices)"
+	default RTC_CLASS
 	help
 	  Say yes here if you want to use your RTCs using the /dev
 	  interfaces, which "udev" sets up as /dev/rtc0 through