COMPMID-1695: (Nightly) bad_alloc in CLIm2Col

Clear CLContext in a more regular basis to make the driver release
memory back to the system.

Change-Id: I0df847766f57719433bbaeada45fe630e38c9541
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/155435
Reviewed-by: Giuseppe Rossini <giuseppe.rossini@arm.com>
Tested-by: bsgcomp <bsgcomp@arm.com>
1 file changed