Incorrect UART Pin Functions / Defines

[oclyke]

mcu/apollo3/hal/am_hal_pin.h has a few omissions and typos. (verified against Apollo3 datasheet v_0_11_0 and confirmed with Ambiq - will be fixed in the next SDK release):

• pin 2 missing #define AM_HAL_PIN_2_UART1RX (0)
• pin 4 incorrectly states which UART module is muxed to function select 5.
  • should be: #define AM_HAL_PIN_4_UART1RX (5)
• pin 10 missing #define AM_HAL_PIN_10_UART1TX (0)
• pin 44 incorrectly stated as having M5nCE6 capabilities where it should have UART0TX.
  • should be: #define AM_HAL_PIN_44_UART0TX (6)

[oclyke]

Re-opened because we are leaving issues open until they are solved in an original SDK release (also accidentally merged directly instead of making a PR)

[oclyke]

Fixed in AmbiqSuiteSDK release 2.5.1