ppp: Move the PPP drivers

Move the PPP drivers into drivers/net/ppp/ and make the
necessary Kconfig and Makefile changes.

CC: Paul Mackerras <[email protected]>
CC: Frank Cusack <[email protected]>
CC: Michal Ostrowski <[email protected]>
CC: Michal Ostrowski <[email protected]>
CC: Dmitry Kozlov <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
15 files changed