musl: Update to 1.2.2 release

Detailed logs are here [1]

* 85e0e351 release 1.2.2
* 3953aecb fix VIDIOC_DQEVENT (v4l2) ioctl fallback for pre-5.6 kernels
* 30f55067 fix v4l2 buffer ioctl fallbacks for pre-5.6 kernels
* db981ffb sh: fix incorrect mcontext_t member naming

[1] https://git.musl-libc.org/cgit/musl/log/?qt=range&q=1e4204d522670a1d8b8ab85f1cfefa960547e8af..85e0e3519655220688e757b9d5bfd314923548bd



Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>