lib: sbi: Allocate from beginning of heap blocks

In the next commit, we'll add a new sbi_memalign() function. In order to
allocate aligned memory, we'll sometimes need to allocate from the middle of a
heap block, effectively splitting it in two. Allocating from the beginning of a
heap block in the nonaligned case more closely matches this behavior, reducing
the complexity of understanding the heap implementation.

Signed-off-by: Gregor Haas <[email protected]>
Reviewed-by: Anup Patel <[email protected]>

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