Using `default y` will not select BMP when CMD_BMP has been enabled, if
it was already configured.
By using `select`, if `CMD_BMP` is turned on, it will force the presence
of `BMP`.
Fixes: 072b0e16c4 ("common: Kconfig: Add BMP configs")
Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
Signed-off-by: Nikhil M Jain <n-jain1@ti.com>