Add dummy ITCM padding linker section, improves memory summary

teensy4/imxrt1062.ld

 		. = ALIGN(16);
 	} > ITCM  AT> FLASH
 
+	.text.itcm.padding (NOLOAD) : {
+		. = ALIGN(32768);
+	} > ITCM
+
 	.data : {
 		*(.rodata*)
 		*(.data*)
 	_heap_start = ADDR(.bss.dma) + SIZEOF(.bss.dma);
 	_heap_end = ORIGIN(RAM) + LENGTH(RAM);
 
-	_itcm_block_count = (SIZEOF(.text.itcm) + 0x7FFE) >> 15;
+	_itcm_block_count = (SIZEOF(.text.itcm) + 0x7FFF) >> 15;
 	_flexram_bank_config = 0xAAAAAAAA | ((1 << (_itcm_block_count * 2)) - 1);
 	_estack = ORIGIN(DTCM) + ((16 - _itcm_block_count) << 15);