Release v0.5.1 of imxrt-ral

Deprecated The following items will be renamed in the next breaking release:

Deprecated item	New item	Notes
flexio1	flexio	1010, 1015, and 1020 families.
AM1F	AM1IE	LPI2C.SIER field.
LOCKUP	LOCKUP_SYSRESETREQ	SRC.SRSR field.
FLEXIO1_*	FLEXIO2_*	CCM.CS1CDR fields.
GPIO_SEL	GPIO_MUX1_GPIO_SEL	1060 IOMUXC_GPR.GPR26 field.
PWR_GLITCH_EN	LVD_EN	1170 SNVS.LPCR field.

Fix the TRNG peripheral block for the 1015, 1021 families.

Fix FlexIO register fields that describe pin counts, ensuring that they can
represent the 32 pins available for FlexIO2 and FlexIO3. Note that this
increases the field width for FlexIO1, even though this instance only supports
16 pins. FlexIO1 users should take care to only access the lower four bits of
such fields.

Fix the FlexIO timer and shifter counts from four to eight, permitting access
to all available components.