CVE-2021-47016

In the Linux kernel, the following vulnerability has been resolved: m68k:
mvme147,mvme16x: Don’t wipe PCC timer config bits Don’t clear the timer 1
configuration bits when clearing the interrupt flag and counter overflow.
As Michael reported, “This results in no timer interrupts being delivered
after the first. Initialization then hangs in calibrate_delay as the
jiffies counter is not updated.” On mvme16x, enable the timer after
requesting the irq, consistent with mvme147.