clocksource: Save mult_orig in clocksource_disable()
clocksource: Save mult_orig in clocksource_disable()

To fix the common case where ->enable() does not set up
mult, make sure mult_orig is saved in mult on disable.

Also add comments to explain why we do this.

Signed-off-by: Magnus Damm <2336f5729424d0c84d319e991b3648cafa2c3c5b@igel.co.jp>
Cc: 2dbbc9a029f6af74f2c2786ce8fa25d932fcaf8c@us.ibm.com
Cc: 38b52dbb5f0b63d149982b6c5de788ec93a89032@linux-sh.org
Cc: 5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org
LKML-Reference: <1ce1f3b481fb0821ef11785f7143a0be62344018@rx1.opensource.se>
Signed-off-by: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>

KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs