Alternative to zero ltv transfer fix

[miguelmtzinf]

Alternative approach of PR #820
Instead of passing the addressProvider address, it's being fetch via calls from the AToken contract.

Downside: We trust on AToken having a POOL function, and Pool having a ADDRESSES_PROVIDER function
Benefit: mainly gas costs

PR#820
	ERC20	transfer	88735	202116	122424	53
	ERC20	transferFrom	91657	149936	117393	11
	FlashloanAttacker	supplyAsset	-	-	219573	1
	MockL2Pool	deposit	145333	229847	198618	414
	MockL2Pool	liquidationCall	281556	469611	383683	44
	MockL2Pool	liquidationCall	338764	377066	357915	2
	MockL2Pool	mintUnbacked	164387	220833	183273	16
	MockL2Pool	supply	145324	251971	195057	247
	MockL2Pool	supply	-	-	221415	2
	MockL2Pool	supplyWithPermit	222379	255348	238864	6
	MockL2Pool	supplyWithPermit	-	-	223410	2
Alternative:
	ERC20	transfer	88520	202007	122310	53
	ERC20	transferFrom	91442	149827	117216	11
	FlashloanAttacker	supplyAsset	-	-	219427	1
	MockL2Pool	deposit	145187	229701	198472	414
	MockL2Pool	liquidationCall	281309	469364	383565	44
	MockL2Pool	liquidationCall	338620	376819	357720	2
	MockL2Pool	mintUnbacked	164268	220723	183620	16
	MockL2Pool	supply	145178	254284	195021	247
	MockL2Pool	supply	-	-	221269	2
	MockL2Pool	supplyWithPermit	222233	255202	238718	6
	MockL2Pool	supplyWithPermit	-	-	223264	2

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[miguelmtzinf]

These changes are now part of #820