APM1 uses channel 11 for camera's yaw servo, APM2 uses channel 8.  This should allow all frame types except octacopters to potentially use a 3 axis camera mount.

ArduCopter - removed references to MOT_1 etc as these are now within the AP_Motors class (i.e. MOT_1 has become AP_MOTORS_MOT_1)

* config variable CONFIG_CHANNELS has possible values
  CHANNEL_CONFIG_DEFAULT or CHANNEL_CONFIG_CUSTOM
* config_channels.h only provides APM1/APM2 mapping when
  CONFIG_CHANNELS == CHANNEL_CONFIG_DEFAULT

Revert "Arducopter Motors Octa: Change V frame MOT_ output ordering."

This reverts commit bdab02f408ddc5451fcb4c6390b2475d31ac657f.

Revert "hexa frame FRAME_CONFIG fixup"

This reverts commit d15e692df613cb728ec671a54dce166f6f1940a0.

Revert "Arducopter Motors Octa: revert OCTA_V_FRAME back to part of OCTA_FRAME"

This reverts commit cb0a8c62fbd07a8ae9dcb8d4fffce337ace1aa1c.

Revert "Arducopter Motors Hexa: Change ordering of MOT designations in Plus frame"

This reverts commit 120d7f9050d5ec9f8fbe02c0ed4f38621949f4ee.

Revert "Arducopter Motors Hexa: Revert HEXA_PLUS_ and HEXA_X_ to single HEXA_FRAME"

This reverts commit 7d65ec311fd2e1222a36d0b34c366e21f3869fcc.

Revert "Arducopter Frames: revert to old HEXA_FRAME and OCTA_FRAME defines."

This reverts commit 47c6e8662f4d5e8fb920f2049338541343d8d18e.

Revert "Add Max's changes for new MOT mappings. Defines new FRAME_CONFIG types."

This reverts commit 8259c90ec7cb29dedac19890cd9a4449b7399e36.

* HEXA_X_FRAME and HEXA_PLUS_FRAME merged back into HEXA_FRAME
* OCTA_V_FRAME merged back into OCTA_FRAME

* HEXA_FRAME has been eliminated and changed to HEXA_X_FRAME and
  HEXA_PLUS_FRAME
* OCTA_FRAME stays the same name for X and +, but the V frame
  configuration requires new OCTA_V_FRAME name.

* APM1 values are not valid, but hopefully APM2 will stay that way?