ipq40xx: 6.1: add missing secure QFPROM symbol

ipq40xx: 6.1: add missing secure QFPROM symbol

Kernel config for 6.1 on ipq40xx is missing the config for
CONFIG_NVMEM_QCOM_SEC_QFPROM which them makes the build stop with a prompt.

Symbol is there in 5.15 config but 6.1 config was based of a version that
does not yet have it set as it was introduced after the 6.1 PR.

So, disable CONFIG_NVMEM_QCOM_SEC_QFPROM to fix building on 6.1.

Fixes: 825cfa4e36cb ("ipq40xx: 6.1: refresh kernel config")
Signed-off-by: Robert Marko <robimarko@gmail.com>