vsprintf: add binary printf

vsprintf: add binary printf

Impact: add new APIs for binary trace printk infrastructure

vbin_printf(): write args to binary buffer, string is copied
when "%s" is occurred.

bstr_printf(): read from binary buffer for args and format a string

[fweisbec@gmail.com: rebase]

Signed-off-by: Lai Jiangshan <redacted>
Signed-off-by: Frederic Weisbecker <redacted>
Cc: Linus Torvalds <redacted>
LKML-Reference: <redacted>
Signed-off-by: Ingo Molnar <redacted>