RTEMS | riscv: Add ESP32-C6 chip definitions (!1186)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on bsps/riscv/esp32/include/c6/chip_definitions.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1186#note_148271

 > + * SUCH DAMAGE.
 > + */
 > +
 > +#ifndef LIBBSP_ESP32_C6_CHIP_DEFINITIONS_H
 > +#define LIBBSP_ESP32_C6_CHIP_DEFINITIONS_H
 > +
 > +#ifndef ASM
 > +
 > +#include <bsp.h>
 > +
 > +#endif /* ASM */
 > +
 > +/*
 > + * References: https://documentation.espressif.com/esp32-c6_technical_reference_manual_en.pdf#intmtrx
 > + * The interrupt matrix supports 77 interrupts. The count of 78 below includes 77 peripheral interrupts plus
 > + * invalid interrupt 1?

Instead of 77 peripherals + 1 for invalid interrupt 0, this is more likely to be 77+4 to be able to identify unique interrupt sources.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1186#note_148271
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