Does not compile on ESP32-S3 chips

[makermelissa]

It does compile for Atmel SAMD51, but does not compile on ESP32-S3 chips. I get the following error:

/Users/melissa/Documents/Arduino/libraries/ExpressivePixelsArduinoPlatformLibrary/EPXPlatform_Runtime.cpp: In function 'void EPXPlatform_Runtime_Reboot(uint8_t)':
/Users/melissa/Documents/Arduino/libraries/ExpressivePixelsArduinoPlatformLibrary/EPXPlatform_Runtime.cpp:42:2: error: 'NVIC_SystemReset' was not declared in this scope
  NVIC_SystemReset();
  ^~~~~~~~~~~~~~~~

After commenting out that function, it continues with this error:

/Users/melissa/Library/Arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld: /var/folders/2t/xvdxpzxn7m7b6qm8mzlswkz80000gn/T/arduino_build_415900/libraries/ExpressivePixelsArduinoPlatformLibrary/EPXPlatform_Runtime.cpp.o:(.literal._Z5_sbrki+0x4): undefined reference to `__HeapBase'
/Users/melissa/Library/Arduino15/packages/esp32/tools/xtensa-esp32s3-elf-gcc/esp-2021r2-patch5-8.4.0/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld: /var/folders/2t/xvdxpzxn7m7b6qm8mzlswkz80000gn/T/arduino_build_415900/libraries/ExpressivePixelsArduinoPlatformLibrary/EPXPlatform_Runtime.cpp.o:(.literal._Z5_sbrki+0x8): undefined reference to `__HeapLimit'
collect2: error: ld returned 1 exit status