configs/stm32l4r9ai-disco/hello: enable SRAM2,3 as heap
configs/stm32l4r9ai-disco/hello: enable SRAM2,3 as heap

update the defconfig

Signed-off-by: sunghan-chang <c954e25285721d8faa8b1a5c1ae2ef5a35338d32@samsung.com>

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