ayn-thor: fix fused kernel args in LinuxLoader.cfg cmdline, add rw rootwait (#9969)

arm64.nopauthfbcon=rotate:3 was two kernel parameters fused by a missing
space, so neither arm64.nopauth nor fbcon=rotate:3 took effect. Also add
rw and rootwait to match the ayn-odin2 LinuxLoader.cfg and the family's
BOOTIMG_CMDLINE_EXTRA; without rootwait the direct-Linux boot path can
race storage enumeration and intermittently fail to mount root.

Author: eldandaman

packages/bsp/ayn-thor/LinuxLoader.cfg

@@ -54,5 +54,5 @@ DisableDisplayHW = true
 Image = "Image"
 initrd = "initrd.img-INITRD_PLACEHOLDER"
 devicetree = "dtb/qcom/qcs8550-ayn-thor.dtb"
-cmdline = "clk_ignore_unused pd_ignore_unused arm64.nopauthfbcon=rotate:3 console=ttyMSM0,115200n8 root=UUID=UUID_PLACEHOLDER"
+cmdline = "clk_ignore_unused pd_ignore_unused arm64.nopauth fbcon=rotate:3 console=ttyMSM0,115200n8 rw rootwait root=UUID=UUID_PLACEHOLDER"