airona: an7583: fix typo for CONFIG_PHY_AIROHA_USB
KConfig flag have an extra whitespace for CONFIG_PHY_AIROHA_USB and
value is not ignored.
Drop the extra whitespace to correctly ignore the value on kernel
compilation.
Fixes: c5b12fc02ab1 ("airoha: Introduce support for Airoha AN7583 SoC")
Signed-off-by: Christian Marangi <[email protected]>
(cherry picked from commit eedc7b3b79efed157636312e255b825d507a7182)