MFC r259125, r264019, r264083, r264153, r264197

r259125:
Fix a few typos on the scm (control module) pin mux definitions.

r264019:
Fix some of the style(9) problems on ti_gpio.

Remove redundant code and declarations.

r264083:
Move the GPIO bank initialization to a new function to make easier to detect
errors.

Reset the GPIO module during the initialization.  This is guaranteed to be
the same as a hardware reset.  Tested on AM335x (BBB) and checked against
the omap3 and omap4 TRM.

Do a better job freeing resources when there are errors and on
ti_gpio_detach().

r264153:
- Fix the setup of interrupts for banks 2 and 3 on AM335x.

    On AM335x each one of the four GPIO banks has two physical interrupt
    lines, so we now allocate resources and setup our interrupt handler for
    all the (8) available interrupts.

    On OMAP3 and OMAP4 there is only one interrupt for each GPIO bank (6
    banks, 6 interrupts), but there are two set of registers where the
    first one is used to setup the delivery of interrupts to the MPU and
    the second set, setup the delivery of interrupts to the DSP.

    On AM335x, each set of registers controls each one of the interrupt
    lines.

- Remove nonexistent registers for OMAP4 and AM335x, replace their use with
  the correct ones for these SoCs.

- Remove stray whitespace.

r264197:
Partially revert r264083.

While it is the recommended initialization procedure, it hangs on the reset
of the second GPIO module on pandaboard.

Removes the module reset for now as more investigation is needed.

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