CC312: Fix build error

Missing {} when PSA_WANT_KEY_TYPE_ECC_KEY_PAIR is defined but
PSA_WANT_KEY_TYPE_RSA_KEY_PAIR is not defined.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: Ib9a4802b926fa7eb7e41b923578480b1242cb611
1 file changed