refactor(build): distinguish BL2 as TF-A entry point and BL2 running at EL3

BL2_AT_EL3 is an overloaded macro which has two uses:
1. When BL2 is entry point into TF-A(no BL1)
2. When BL2 is runnin

refactor(build): distinguish BL2 as TF-A entry point and BL2 running at EL3

BL2_AT_EL3 is an overloaded macro which has two uses:
1. When BL2 is entry point into TF-A(no BL1)
2. When BL2 is running at EL3 exception level
These two scenarios are not exactly same even though first implicitly
means second to be true. To distinguish between these two use cases we
introduce new macros.
BL2_AT_EL3 is renamed to RESET_TO_BL2 to better convey both 1. and 2.
Additional macro BL2_RUNS_AT_EL3 is added to cover all scenarious where
BL2 runs at EL3 (including four world systems).

BREAKING CHANGE: BL2_AT_EL3 renamed to RESET_TO_BL2 across the
repository.

Change-Id: I477e1d0f843b44b799c216670e028fcb3509fb72
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Signed-off-by: Maksims Svecovs <maksims.svecovs@arm.com>

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feat(ls1046a): add new SoC platform ls1046a

The LS1046A is a cost-effective, power-efficient, and highly
integrated system-on-chip (SoC) design that extends the reach
of the NXP value-performance li

feat(ls1046a): add new SoC platform ls1046a

The LS1046A is a cost-effective, power-efficient, and highly
integrated system-on-chip (SoC) design that extends the reach
of the NXP value-performance line of QorIQ communications
processors. Featuring power-efficient 64-bit Arm Cortex A72
cores with ECC-protected L1 and L2 cache memories for high
reliability, running up to 1.8 GHz.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Signed-off-by: rocket <rod.dorris@nxp.com>
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Change-Id: I208d9bf1702410463c2b2630d31d0cd4eb7e8837

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