First pass at creating petal_sm variant

Author: beserge

boards.txt

@@ -3732,6 +3732,17 @@ GenH7.menu.pnum.DAISY_PATCH_SM.build.variant=STM32H7xx/H742I(G-I)(K-T)_H743I(G-I
 GenH7.menu.pnum.DAISY_PATCH_SM.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
 GenH7.menu.pnum.DAISY_PATCH_SM.build.ldscript=DAISY_SEED.ld
 
+# Daisy Petal SM board
+GenH7.menu.pnum.DAISY_PETAL_SM=Daisy Petal SM
+GenH7.menu.pnum.DAISY_PETAL_SM.upload.maximum_size=131072
+GenH7.menu.pnum.DAISY_PETAL_SM.upload.maximum_data_size=524288
+GenH7.menu.pnum.DAISY_PETAL_SM.build.board=DAISY_PETAL_SM
+GenH7.menu.pnum.DAISY_PETAL_SM.build.product_line=STM32H750xx
+GenH7.menu.pnum.DAISY_PETAL_SM.build.variant_h=variant_{build.board}.h
+GenH7.menu.pnum.DAISY_PETAL_SM.build.variant=STM32H7xx/H742I(G-I)(K-T)_H743I(G-I)(K-T)_H750IB(K-T)_H753II(K-T)
+GenH7.menu.pnum.DAISY_PETAL_SM.build.peripheral_pins=-DCUSTOM_PERIPHERAL_PINS
+GenH7.menu.pnum.DAISY_PETAL_SM.build.ldscript=DAISY_SEED.ld
+
 # Generic H742IGKx
 GenH7.menu.pnum.GENERIC_H742IGKX=Generic H742IGKx
 GenH7.menu.pnum.GENERIC_H742IGKX.upload.maximum_size=1048576