arm: Remove stray .mmutable reference in linker script

The .mmutable section was deprecated in 2012 [1] and finally removed
entirely from U-Boot in 2022 [2], so this special handling is no longer
necessary. Remove it to tidy up the linker script.

[1]: dde3b70dcf3d ("arm: add a common .lds link script")
[2]: 3135ba642f9a ("arm: pxa: Remove CONFIG_CPU_PXA25X")

Signed-off-by: Sam Edwards <CFSworks@gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
1 file changed