libc/printf: Use compiler-provided 64 bit math, phase 2
libc/printf: Use compiler-provided 64 bit math, phase 2

Remove the function wrappers around the 64 bit math and just use C
syntax natively, combining ops where appropriate (e.g. there was a
sequence implementing "(x<<2+x)<<2" to do "multiply by 10").  The
_ldiv5 and _rlrshift routines are non-standard ops that provide useful
abstraction, so they remain as separate functions.

Change-Id: I4d83847348fdd7be09887b833c8ccbd2aa1e4182
Signed-off-by: Andy Ross <c70f9a6bf6ee0cd69c8af4ce5e6b131945769315@intel.com>

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