units: Add SI metric prefix definitions

stable inclusion
from stable-v5.10.166
commit 8ebc2efcb6d6731c12a3c3b18f9c2d17b651e888
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I87FRA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8ebc2efcb6d6731c12a3c3b18f9c2d17b651e888



--------------------------------

[ Upstream commit 26471d4a ]

Sometimes it's useful to have well-defined SI metric prefix to be used
to self-describe the formulas or equations.

List most popular ones in the units.h.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Stable-dep-of: c8c37bc5 ("i2c: designware: use casting of u64 in clock multiplication to avoid overflow")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>