kernel: bump 4.14 to 4.14.81
Refreshed all patches.
Removed upstreamed patches:
- 081-spi-bcm-qspi-switch-back-to-reading-flash-using-smal.patch
Altered patches:
- 0054-cpufreq-dt-Handle-OPP-voltage-adjust-events
Compile-tested on: cns3xxx, imx6, ipq806x, x86_64
Runtime-tested on: cns3xxx, imx6, x86_64
Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>