AT91 defconfig for 5.15:

- add defconfig entries for new SoC: SAMA7G5
  - dedicated sama7_defconfig which avoids having to carry older drivers
    and dependencies from the sama5 family:
    CACHE_L2X0, CAN_AT91, TOUCHSCREEN_ADC, AT91SAM9X_WATCHDOG,
    VIDEO_ATMEL_ISI, SND_ATMEL_SOC_I2S, MMC_ATMELMCI, AT_HDMAC, AT91_ADC,
    REGULATOR_ACT*
    Addition of new drivers that are not part of any sama5 SoC:
    SND_MCHP_SOC_I2S_MCC, SND_MCHP_SOC_SPDIFTX|RX, MICROCHIP_PIT64B
    plus upcoming MIPI pipeline, audio sample rate converter, ...
    It also maintains both sama5 and sama7 defconfig tailored for their
    respective families and easy to identify.
  - addition to the generic multi_v7_defconfig
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