spec_test_on_nuttx.yml: Retire CONFIG_EOL_IS_LF (#3676)

It has been removed in nuttx while ago:
https://github.com/apache/nuttx/pull/8628

.github/workflows/spec_test_on_nuttx.yml

@@ -230,7 +230,6 @@ jobs:
           kconfig-tweak --enable CONFIG_RISCV_SEMIHOSTING_HOSTFS_CACHE_COHERENCE
           kconfig-tweak --enable CONFIG_XTENSA_SEMIHOSTING_HOSTFS
           kconfig-tweak --enable CONFIG_XTENSA_SEMIHOSTING_HOSTFS_CACHE_COHERENCE
-          kconfig-tweak --enable CONFIG_EOL_IS_LF
           kconfig-tweak --enable CONFIG_LIBC_FLOATINGPOINT
           kconfig-tweak --set-val CONFIG_NSH_LINELEN 255
         working-directory: nuttx