go-cross-canadian: use gcc-crosssdk, not gcc-native

The recipe was building native go against build host headers and libraries,
and then installing it as a nativesdk item, which is entirely incorrect. This has
been working by coincidence (go generally uses C and C libraries lightly)
but with go 1.20 this turned into hard breakage.

Also nativesdk sysroot was being passed in incorrectly.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>