CONFIG_ARCH_STMP378X is not available for the default architecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_STMP378X.
Result is shown for kernelversion 5.4.140

Freescale STMP378x

modulename: stmp378x.ko
configname: CONFIG_ARCH_STMP378X

Select STMP3xxx chip family
└─> Freescale STMP378x

STMP378x refers to 3780 through 3789 chips

source code: