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arm-trusted-firmware-mediatek: feat(libc): add %c to printf/snprintf

Piotr Kubik requested to merge pkubik_mtk-atf-fix-boot-fail-with-sb-and-mbedtls-2-28-4 into devel

With OpenWrt 23.05 uplift MbedTLS was updated to 2.28.4. MbedTLS commit: 889534a4 ("Fix segfault in mbedtls_oid_get_numeric_string") started using %c snprintf format specifier which was unimplemented in ATF libc snprintf. This resulted in BL2 boot hang for secure boot enabled builds.

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