Misleading output about VK_RZ_A1H and RZ_A1H in 5.7

[MarceloSalazar]

Branch: mbed-os-5.7.0-oob

It seems VK_RZ_A1H and RZ_A1H (Cortex-A) are not supported.

We should update the message "Will be supported in mbed OS 5.6" with something like "Will be supported in a future version of Mbed OS"

@0xc0170

mac:~/mbed/OOB/5.7/mbed-os-example-blinky$ mbed compile -t GCC_ARM -m VK_RZ_A1H
Building project mbed-os-example-blinky (VK_RZ_A1H, GCC_ARM)
Scan: .
Scan: mbed
Scan: env
Scan: FEATURE_LWIP

Could not compile for VK_RZ_A1H: VK_RZ_A1H Will be supported in mbed OS 5.6. To use the VK_RZ_A1H, please checkout the mbed OS 5.4 release branch. See https://developer.mbed.org/platforms/Renesas-GR-PEACH/#important-notice for more information

[toyowata]

@MarceloSalazar
The PR is still in review here:
ARMmbed/mbed-os#5628

[0xc0170]

Thanks @toyowata .

We should update the message "Will be supported in mbed OS 5.6" with something like "Will be supported in a future version of Mbed OS"

The message comes from mbed-os, it should be requested there, it's not part of this example.

[MarceloSalazar]

@theotherjimmy please have a look. We'll appreciate if you could patch this on Mbed OS.