Build: Disable configs with oversize issue

Following configs has oversize issue which causes build failure:
    lpcxpresso55s69_GNUARM_IPC_2_Relwithdebinfo_BL2_NS_MEDIUM
    stm32l562e_dk_ARMCLANG_LIB_1_REG_Release_BL2_NS

Disable these configs for the time being to avoid blocking CI.
This patch will be reverted once the issue has been addressed.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Id9c14955fb68038a0297f32ca2738a2c5eacc56b
1 file changed