arm64: defconfig: Enable drivers for BeaglePlay

arm64: defconfig: Enable drivers for BeaglePlay

Enable drivers used on BeaglePlay[1]:
* MDIO_GPIO driver to workaround erratum i2329, DP83TD510 SPE phy
  (enabled in-kernel to ease usage)
* TPS65219 PMIC, regulator as built-in for sd boot and power button
  as modules. (note: this is also used by am62x-lp-sk as well)
* BQ32K battery backedup RTC and the K3 RTC drivers as modules
* OMAP2 SPI driver as module for accessing mikrobus

bloat-o-meter reports after this change (v6.3-rc1, clang 17.0.0):
add/remove: 63/2 grow/shrink: 3/0 up/down: 17660/-16 (17644)
[...]
Total: Before=27747186, After=27764830, chg +0.06%

[1] https://beagleplay.org

Reviewed-by: Dhruva Gole <d-gole@ti.com>
Link: https://lore.kernel.org/r/20230316152143.2438928-4-nm@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>