sunxi: add testing Linux 5.10

Add testing Linux kernel 5.10 for sunxi targets.

Removed patches were replaced by upstream commits:

- 410-v5.6-arm64-dts-allwinner-a64-olinuxino-Add-bank-supply-re.patch
   f0c3b29f56f0a arm64: dts: allwinner: a64: olinuxino: Add bank supply regulators

- 420-v5.7-arm64-dts-allwinner-a64-olinuxino-add-user-red-LED.patch
   89866b2667e0d arm64: dts: allwinner: a64: olinuxino: add user red LED

- 440-add-h6-pwm.patch
   a7fe985633f92 pwm: sun4i: Add an optional probe for reset line
   b8d74644f34a8 pwm: sun4i: Prefer "mod" clock to unnamed
   5b090b430d750 pwm: sun4i: Add an optional probe for bus clock
   fa4d81784681a pwm: sun4i: Always calculate params when applying new parameters
   9f28e95b5286f pwm: sun4i: Add support to output source clock directly
   fdd2c12e3761f pwm: sun4i: Add support for H6 PWM

- 441-arm64-dts-add-PWM-node.patch
   88432f5f8469b arm64: dts: allwinner: h6: Add PWM node

- 443-board-h6-orangepioneplus-fix-missing-ethernet.patch
   7ee32a17e0d65 arm64: dts: allwinner: h6: orangepi-one-plus: Enable ethernet

Run tested on friendlyarm,nanopi-neo (allwinner,sun8i-h3), looks all good.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>